Display screen with a graphical user interface



The single FIGURE is a front view of a display screen with a graphical user interface showing the claimed design.

The outermost broken lines including the outer broken line showing of rounded shapes, illustrates an electronic device and form no part of the claimed design. The broken lines at the perimeter of the figure illustrate a display screen and form no part of the claimed design. The remaining broken lines, including the closely spaced broken lines showing text and icons, illustrate portions of the graphical user interface that form no part of the claimed design. 

CLAIM The ornamental design for a display screen with a graphical user interface, as shown and described. 